Evaluation of metrological performance of electromagnetic current measurement transformers in non-sinusofdal conditions

Electrical generation systems are going to include a growing amount of solar and wind energy, characterized by time variant flow of energy and, very often, with a relevant distortion. These aspects give more and more emphasis to monitoring of conducted disturbances on power systems over a wide frequency range and, consequently, voltage and current transducers, adopted for this aim, must have a proper frequency bandwidth. Voltage and current transformers, which are the most installed transducers in electrical power systems, are typically constructed to operate only at industrial frequency, 50/60 Hz, but it is clear that their substitution would require an unsustainable cost. Anyway, the utilization of accurate models for them could help to improve their metrological performance. In order to build an accurate model, it is important to start from the characterization of their performance in real operating conditions. Therefore, in this paper some experimental tests in sinusoidal and non sinusoidal conditions are performed on an electromagnetic current measurement transformer.